摘要
分布式发电是能源互联网的研究重点,并网逆变器是分布式发电系统的核心部分,电容电流反馈有源阻尼广泛应用于LCL型并网逆变器中,其有效地抑制了系统的谐振尖峰。但在数字控制下,电容电流反馈有源阻尼引入的控制延时,将改变系统的相位特性,影响系统的鲁棒性。为此,提出了一种LCL型逆变器的鲁棒延时补偿并网控制方法,包括电容电流反馈延时补偿和增加零极点延时补偿策略,其有效地降低了电容电流反馈有源阻尼中的控制延时,提高了系统的鲁棒性和动态性。以单相LCL型并网逆变器为例,仿真和实验结果验证了所提方法的有效性。
Distributed generation is research focus of energy internet. Grid-connected inverter is core part of distributed generation systems. Capacitive-current-feedback active damping widely used in LCL-type grid-connected inverter can effectively inhibits resonant peak. However, control delay is introduced by digital control, and delay element changes system phase-frequency characteristics, affecting system robustness. For this reason, a robust time delay compensated grid-connected control method for LCL-type inverter is proposed in this paper, including delay compensation of capacitive-current-feedback and increasing zero and pole. It can effectively reduce control delay introduced by capacitive-current feedback active damping and improve system robustness and dynamics. Simulation and experiment results with LCL-type single-phase grid-connected inverter verify validity of the proposed strategy.
出处
《电网技术》
EI
CSCD
北大核心
2015年第11期3102-3108,共7页
Power System Technology
基金
国家自然科学基金重点项目(51237003)
国家自然科学基金面上项目(51577056)
中央高校基本科研业务费专项资金~~
关键词
能源互联网
并网
逆变器
鲁棒
延时
补偿
反馈
零极点
energy internet
grid-connection
inverter
robust
time delay
compensation
feedback
zero-pole
